ITechGeek at 17:04, 3 April 2012

2012-04-03T17:04:30Z

← Older revision		Revision as of 17:04, 3 April 2012
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			[[Category:FPGAWorkshop]]

	''These notes are intended to highlight bits of information from the Xilinx KCPSM3 manual distributed with the microprocessor''		''These notes are intended to highlight bits of information from the Xilinx KCPSM3 manual distributed with the microprocessor''

Williamgibb at 00:23, 27 January 2010

2010-01-27T00:23:04Z

← Older revision		Revision as of 00:23, 27 January 2010
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			''These notes are intended to highlight bits of information from the Xilinx KCPSM3 manual distributed with the microprocessor''

	'''Xilinx Picoblaze'''		'''Xilinx Picoblaze'''

Williamgibb at 00:22, 27 January 2010

2010-01-27T00:22:04Z

← Older revision		Revision as of 00:22, 27 January 2010
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	'''other picoblaze ide/assemblers/simulators/implementations that are not from xilinx'''		'''other picoblaze ide/assemblers/simulators/implementations that are not from xilinx'''

	'''pacoblaze''' [www.bleyer.org/pacoblaze/] opensource, picoblaze compliant verilog implementation. complete with java assembler.		#'''pacoblaze''' [http://www.bleyer.org/pacoblaze/ Pacoblaze] opensource, picoblaze compliant verilog implementation. complete with java assembler.
			#'''openPicIDE''' [http://www.openpicide.org/ openPicIDE] opensource picoblaze ide/assembler/simulator. very robust! works on linux, mac, windows.
	'''openPicIDE''' [www.openpicide.org/] opensource picoblaze ide/assembler/simulator. very robust! works on linux, mac, windows.		#'''mediatronix picoblaze ide''' [http://www.mediatronix.com/tools/index.htm mediatronix] amazing windows picoblaze ide
			#'''kpicosim''' [http://www.xs4all.nl/~marksix/ kpicosim] picoblaze simulator and assembler. linux
	'''mediatronix picoblaze ide''' [www.mediatronix.com/tools/index.htm] amazing windows picoblaze ide

	'''kpicosim''' [www.xs4all.nl/~marksix/] picoblaze simulator and assembler. linux

Williamgibb: Created page with ''''Xilinx Picoblaze''' KCPSM3 - An 8 Bit Microcontroller for Xilinx Spartan 3 & Virtex 2/4 devices '''What is kcpsm3''' Very Simple microcontroller. Can be used for data proce…'

2010-01-27T00:19:46Z

Created page with ''''Xilinx Picoblaze''' KCPSM3 - An 8 Bit Microcontroller for Xilinx Spartan 3 & Virtex 2/4 devices '''What is kcpsm3''' Very Simple microcontroller. Can be used for data proce…'

New page

'''Xilinx Picoblaze'''

KCPSM3 - An 8 Bit Microcontroller for Xilinx Spartan 3 & Virtex 2/4 devices

'''What is kcpsm3'''

Very Simple microcontroller.
Can be used for data processing or as a complex state machine.

'''KCPSM''' - ('''K''')constant '''C'''oded '''P'''rogrammable '''S'''tate '''M'''achine

Its very small - 96 Spartan3 slices + 1 block ram

Our boards - 4656 slices -> that is 2% of the slice resources!

Entirely embedded in the fpga fabric - integrates with all the logic you've already been writing!

'''kcpsm is small'''

Konstant explained - notice how the mips = 1/2 clock speed?

CPI of the processor is 2. And fixed at 2. that makes it very easy to determine the runtime of a program in an embedded system.

'''kcpsm3 architecture'''

architecture is closed (it is a xilinx macro, not a readily readable verilog design)
but the architecture is not secret though

simple input port/output based IO, up to 256 addressable 8bit ports/devices
16 general purpose registers
64 byte memory/scratch pad
alu with carry/zero flags
single interrupt line/acknowledge
program counter
control/instruction decoder
program memory

'''device features'''

program memory - 1 18kb block ram! this stores 1024 18 bit instructions.
16 general purpose registers. No dedicated zero register or accumulator
alu - does add/sub/add&sub with carry
alu - load/and/or/xor bitwise
alu - shift/rotates
flags and flow control - help determine program flow with carry/zero flags + conditional jump/call instructions
interrupts - jumps to a single address (initiates CALL 3FF) - an ISR

'''using the kcpsm3'''
used as a verilog module in the design flow. simply copy the kcpsm3.v file into your project and instantiate it
kcpsm3 assembler generates a verilog memory file - use that in your design as well. connect the two modules together.
alternatively - use the embedded_kcpsm3.v file

'''instruction set'''
#program control group
##unconditional jump
##conditional jumps (branches!)
##call/return with stack depth of 31
#interrupt group
##enable/disable interrupt
##return from isr & either enable/disable the interrupt
#storage group
##store/fetch data from the scratch pad
#i/o group
#arithmetic group
##add/sub/compare
###work with 2 operands or 1 operand and a constant
#logical group
##load/and/or/xor/test
###work with 2 operands or 1 operand and a constant
#shift/rotate group
##both left/right shifts available

pointers available

'''port access'''

input and output ports available.

very simple with the two cycle operation
#1st cycle - instruction decode
#2nd cycle - instruction execute

Read strobe - not needed, port_id used w/ a mux to determine what gets put on input port. data captured by kcpsm3 on next clock edge.

write strobe - use as a clock enable signal for external circuitry to capture data from out port.

<8 output ports, use 1hot addressing

>8 output ports, use address decoder to enable the correct port

input ports -> leads itself to a multiplexed architecture

'''reset'''

synchronous to kcpsm3 clock. blanks the processor and restarts it at address 0x000.

'''picoblaze assembler'''

xilinx assembler is a dos program, which accepts .psm (picoblaze assembler) source files and outputs vhdl/verilog files for your use
multipass, lots of quick information. don't be afraid to dump the file.

possible to run under wine/dosbox, lots of alternatives available.

'''program syntax'''

#blank lines are ignored
#comments begin with ;
#registers - form sX, where X={0,1,2,..9,A,...,E,F}
#constants
#Data value - 00 ->FF
#Port value - 00 ->FF
#Address - 000 ->3FF
#Line labels: Useful for call and jump instructions!

constant -> define a label used within the program for holding a constant value. like a C macro

namereg -> define a label used within the program for identifying a register. allows for much more readable code.

'''Interrupts'''

slides are really detailed about this and good - read them

'''call/return stack'''

31 level call/return stack. program counter preserved upon the calll instruction or interrupt.
registers are not preserved - be
careful not to clobber your registers.

'''simulation'''
picoblaze assembly simulators exist - > prove your code by hand (slow)
nothing stopping you from simulating the HDL design - but can be very slow.
quicker to fix hardware design -> then code and download to picoblaze via jtag and run the software.

'''other picoblaze ide/assemblers/simulators/implementations that are not from xilinx'''

'''pacoblaze''' [www.bleyer.org/pacoblaze/] opensource, picoblaze compliant verilog implementation. complete with java assembler.

'''openPicIDE''' [www.openpicide.org/] opensource picoblaze ide/assembler/simulator. very robust! works on linux, mac, windows.

'''mediatronix picoblaze ide''' [www.mediatronix.com/tools/index.htm] amazing windows picoblaze ide

'''kpicosim''' [www.xs4all.nl/~marksix/] picoblaze simulator and assembler. linux

FPGAWorkshop13notes - Revision history

ITechGeek at 17:04, 3 April 2012

Williamgibb at 00:23, 27 January 2010

Williamgibb at 00:22, 27 January 2010

Williamgibb: Created page with ''''Xilinx Picoblaze''' KCPSM3 - An 8 Bit Microcontroller for Xilinx Spartan 3 & Virtex 2/4 devices '''What is kcpsm3''' Very Simple microcontroller. Can be used for data proce…'